I have a save file if you need it.

 

...and a screenshot too. Unfortunately, I can't attach it to this post for some reason.

 

 

Hiravias: "No, no. What's impressive is cleaving a man's spine WITHOUT lopping his head off too. THAT takes aim"

 

My PC speaking with Eder's voice: "Did that once. In my case it was an accident and I still wake up some nights feeling bad for him"

Yea, I occasionally get the wrong NPC's talking too, especially in regard to the barks they make when moving and in stealth. I can't seem to cause it to happen on purpose, though. But the game loses focus of who is talking on occasion. Another minor bug that may be known to the devs, but low priority.